Rail-bond.



UN]TED. P ENT OFFICE EUGENE W. VOGEL, OF CHIOAGO, ILLINOIS, ASSIGNOR TOTHE RAILROAD SUPPLYCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

RAIL-B OND.

Specifieaton of Lette rss Patent.

Patented Oct. 27, 1908.

Application filedlebruary 9, 1906. Serial No. 300,218.

and use the seme, reiqrenoe beingbed to the of this specifiootion.

ll/Iy invention relates in general to an im provement in electrrcalbonds for umtmg 'two conduotor, such for instance as tl1e edjecent endsof milroad rails, and more perticulerly to terminels uniting tl1e ondeof the bond to the conduotors.

lt is desirnble in bonding rails thet the terminale of the bond shouldbe closcly and securely unitd to the rails uniforinly thiough out theportions thereof within the holes in the rails to eecureolectriceleonnections hem ing a minimum reeistence..

.In order tl1zit the terminale of the bond may be driven into holes inthe rail or other co1rductorS, it is oustomary to 1noke them tnpered orwedge sheped. Practicr l1as demonstmtod tlmt a tzqiered terminal whendriveninto a cylindricel hole does not form close eleotrical contectwith the surface of tlie oonductor nround the hole owing to thedifierence in dinmoter of the portion of the terminal within the hole.

.The primery object of my invention is to provide a terminal for anelectric bond Which mey be rendily driven into a eylindricol hole in aconduotor and wbich Will uniformly contact with the Wnll eround thehole.

A further objoct of my invention is to provide a terminal for unelectricel bond the outor surface of wbich will be displuced wheirdriven thereby lorming e. uniorm contact between the entire suilbce ofthe terminal witliin the hole and the well surrounding the hole.

A still urtlrer objeot ol iny invention is to provide e bond l'orelcctricelly uniting con- -ductore WlllCll Wlll be simple inconstruction, inexpensive in manufacture, and efficient in use.

My invention generalldescribed consists of a terminal for an electricelbond having superficiel grooves ther in whereby when tbe terminal isdrive-n into :1 hole in a conductor the portion of the terminal adjacentits surface Will be displeced t0 permit the por tion of the terminalWithin the holeto uniformly contact With the wall nround the hole.

My invention furthe1 consists of en doctricol bond provided Withintegrel terminale et the onde thereof. ha.ving superficiel groovetherein se thet the terminale When driven into holes in the conductorsWill unitormlg contact With the surfaces of the conduotors around thefioles.-

My invention Will'be hereinafter With reference to the accompenyingdra.wing in which the sentie is illdstreted es embodied in severnlpra.cticel forms, and in which Figure 1 is en elevetional vieW oidportion more fully desoribcd of a bond With a terminal secured thereto;

Fig. 2 a sectional view on line 22 Fig. 1; Fig. 3 et cross section online 33 Fig. 2, showing the terminal rovided with a cont ing; Fig. 4: aview simi ar to Fig. 1 of a modi fioetion; Fig. 5 a. view on a redueedscele slrowing a bond in position uniting the ndjL- cent ends of therails of the track; Fig. 8 en elevetionelview of ai modification; 7 a.sectionel view on line 7'7 Fig. 6; Fig. 8 9. view similer te Fig. 6showing still enother modificition and Fig. 9 a sectionel view on line99 Fig. 7.

Similer reference oheraoters are used to designete siniilar perts'in theseveral figures of the drewing.

-Referring more particularly to Figs. 1, 2 and 3 relerence character Aindicates.one terminal et au bond B. The terminal is provide'd with abevel C1; et one end thereof and is ..slightly tapered te faoilitete itsbeing driven into a. cylindrical hole in a donductor; The surface of theterminal A is provided with one or more groovos a preierably to pered inwidth and depth in the somo direc% tion in Which the terminal, istepered.

In Fig. 4 the terminal A is shown cylin drical and provided with abeveled end a. Une or more grooves a are in the surface of the terminalA such grooves being tepered inwidth and depth and decreasirn in crosssection from the beveled end a t( .verds th driving heed b.

The bond mey be conveniently formed in tegrally With terminale, snob a.sshown in Fig. 1 or Fig. 4:. The terminale may be formed on the onde etthe bond by upsetting or forging. The terminals are provided with iormot terminal wrth a decreamng cross secdriVing heads b by means of Whiehthey may be readily driven into the holes in the conductors which are tobe bonded. 111 Fig. 5 I

have shown the terminals A A on the bond B driven intoholes in theadjacent ends of the rails C C C indicates the usual'fish plates forforming the joint betwen the rails. ]My invention may be embodied invarious types of terminals and in F igs. 6 toi) 1 have.

shown it as applied to the well known chan nel pins which are placedaround the ends of a bonding Wire and driveninto holes in the adjacentends of rails or other eonduotors.

In Fig. 6 the channel pin A is shown as pro- 2 vided with a beveled end(L and with one or more suptirficial grooves a 0f tapered width anddepth confornnng to the taper ol" the pn1. In Fig. 7 the grooves a areshown as two in number but it is obvious-that one or more ol" suchgrooves may be provided in the pin.

In Fig. 8 I have shown my invention applied to a channel pin A oieylin.drical form and provided with the usual beveled end a. Une or moregrooves a areprovided in the surface of the pin, such grooves beingtapered in width and depth l'rom tire bmelod end towards the drivingend.

When lire terminal is cylindrical in l'orm and either solid as shown inFig. 1 or chair.-

neled as shown in lfligs. 6, 7 and 9, the boiveled end a is insertedin.a hole in the rail or other eonductor and 'power in the form .ol"blows from a suitable implement applied to the driving end. Tireterminal thereby driveri into the hole of the conductor and during suchdriving the portion thereof near its surface is displaced by the Wallaro1n gld the hole, such displacement being permittd by the superlieialgrooves in the pin. 'lbe grooves are closed oitber partially or entire,y

during tire driving operation thereby pvrmib ting tire portion ol tirepin within t-he hole alssuming a eylindrioal l'or-m and (:losely enga'-in witl1 tire surface of the wall ar6 uhd tl ;re ho%e.

When the terminal is o ylindrioal, as sboWn in Fig. 4 in. solid l'orm,and. in l*'ig.'t in lino l'orm ol a ehannel pin, tl1e taporod snporliihlgrooves pormit tbo displacmnontol' l.be su"- l'aco as it in driver}, soUnit lire pin all.hongl1 ol' sligbtly greator diamcter originally tbantire hole, passes tl1rouglr tire l1ole and ('losely engages the wallsurrounding tire same. By making the gro( ves in tire eylirdriealterminal gradually decroasing in cross s ;otion l'rom tire beveled endtowards the driving end, lire p'ortion ol' tire pin. whioh travelsl'urtb(*st relativoly to the bole in tire eonduvtor in pormilted lo novontraot as lo permit tire pin to be readily driwnand at tire Saine Limemsurc a close contact botwuon tbo Mirliton tho bole.

By providing the grooves in the tapered tion from the beveled endtowards the driv ing head, the amount of contraction permit ted variesaoeording to the diameter thereby resulting in the portion of theterminal within the holes being eylindrical and uniformly contaetingwith tire wall around the hole.

In order that a more permanent contact may be iormed between theterminal and the eonductor, tire terminal may be ooated with a soit1netal, suoh as tin, lead, or Babbitt metal. In Fig. 3 B indicates thecoating Which fills the grooves a While in Fig. 9 B

5 indieates the coating wlrieh fills tlie grooves a As the terminals aredriven and the groove thereby elosed the soft metal of the coating issqueezed outwardly and forced against tire wall around the hole of theconduetor thereby inSuring contact between the terminal and the Wallaround the hole al ong t11e lines of the grooves.

From the foregoing description it Wlll be observed that I have inventedterminals for a bond Wl1icll may be readily driven into a cylindricalhoie in a conductor and which when driven will l'orm a uniforrn contactwith tire wall around the l1olo tbereby reducing tire r0- sistance ol'the connection to a minimum.

lt \\ill also be ol ser-ved that i haro invented an improved bondl1aving terminals provided witl1 superlieiai grooves thereby permittingthe metal o tire terminals to be so displaegd when driven as to resultin a close and uniform contact between the terminals and the Wallsaround tire boles into which they are driven. V 7

liaWing now. l'ully desrribed my invention, what i daim as now anddesiro lo secum by Letters Patent is: r

15 A rigid terminal l'or an eieot1'ical bond adapted to be driven 'intoa hole in a condnctor and having sl1allowsnpuflicial;1rooves in theportion thereol' which is adapted to engage with lire wall snrronndingtire Inde.

2. A terminal l'or :in vivrtlical bond adaptod,t.o be driven into al1olo in a eonduclor and baring tapercd 'snporlicial groovos in tlioporlion lilll(0l" adaptod lo entor lire lroio.

23. A l.apor -d lorminal l'or olwlriral bonds adaplwl lo be drivon in 21Inde in a -ondnrtor and lnn"nn in lire portion adaplrd to enter lirelroJo a ;npellirial groom tapered Lo correspond to tire taper ol tireterminal.

l. A bonding pin l'or elertrioally nniting ('()Jl(ill('l()l'S bavingsuperlicial groovvs theroi3i 'and havm,g a toalmg ol soit motal tbereon.

'5. bond l or elellrically nnitin; cond uiz itorslmvinganintograllorn1inaI,saidterminal providod n'illl taporodgrooves.

"Z. A bond l'or *lw-lrioally nniling vondnr- Timing a ta pe1od terminal,sain] terminal extendin throughout the grcntcr portion of having grnoveschemin corresponding to the 1 the lengtl thereof. V 15 taper 01 1h43ter1nina, and 21 eoating '0f s0ft 11. ,A bond .f01 electrically unitingcon: mets! un snid terminal filling the groves ducto1s having an ingrnlterminal provided 5 thrcin. 1 with a iongitudinally extonding tapered 8.A bond for electricul]y uniting conducgroove. tors hnving n tuperedter1ninnl,snid terminal In testimony whereof, I sign this specifica- 20ha.ving grooves thercin, and a conting of s0ft tian in the prescnce oftwo witnesses. metai on sa1d ternnnnl, i1lhng the grooves EUGENE V.VOGEL 10 therem.

9. bonding pin hzwing a tapered groove cxt.ending longthwise the1eof.

10. A bonding pin having a tapered groove \Vitnesscsz 4 1 1 G0. L.WILKINSON,

i (3. A. MULLEN.

